A281830 Number of n X n 0..1 arrays with no element equal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards.

1, 8, 163, 8240, 1053407, 324602161, 249711414322, 479393254207028, 2274674243457364486

Offset

1,2

Comments

Diagonal of A281837.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..0..0..0..0. .0..1..0..0. .0..1..1..0. .0..1..1..0. .0..0..0..1
..1..0..1..0. .1..1..0..1. .0..1..0..1. .0..0..1..0. .0..1..1..1
..0..1..1..1. .1..0..1..0. .1..0..0..1. .1..0..0..0. .1..0..1..0
..0..1..0..0. .0..0..1..1. .1..1..0..1. .1..1..1..1. .1..0..0..1

Crossrefs

Cf. A281837.

Sequence in context: A143857 A025606 A224899 * A299075 A299840 A353777

Adjacent sequences: A281827 A281828 A281829 * A281831 A281832 A281833

Keyword

nonn

Author

R. H. Hardin, Jan 31 2017

Status

approved